Tire-inflater.



M. A. MARQUETTE.

TlRE INFLTER. APPLICATION HLED SEPT. 3, 1913. l., Patented 13.11.15, 1918.

WI TNESSES iaeae.

To'wwmttmay concern lBe it known that l, MnLvoN A. MAR- 'QUnr'rn a citizen of the United States, re.

siding at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful lmproveinents in Tire-lniaters, of which the followin is a description.

y invention relates to improvements in means for indating tires.

rlhe object of my invention is to provide detachable means for automaticall maintaimng the tire inflated at any desired degree of pressure;

ln the accompanying drawings wherein like or similar reference characters represent likeor corresponding parts:

Figure 1 is a side elevation of a" wheel having a pneumatic tire and equipped with my improvement.

Fig. 2 is al1-enlarged central longitudinal y section of the controlling mechanism of my device.

Fig. 3 is an enlarged fragmentary central longitudinal section'of my device taken at substantially right angles to the section shown in Fig. 2.

lln the form shown in the drawings an an-.

nular tank or bottle 4 is provided containing a highly compressed gas such for example as air or carbonic acidgas and secured to the spokes or other convenient portion ofvan automobile wheel 2 by suitable clamps 3 or other convenient means for rigidly maintaining the bottle in position on the wheel.

tube 6 provided within the bottle 4 is rigidly secured in a radial position to the Y outer wall thereof. Avalve 7 preferably of siibstantially the usual form and construction employed for preventing the escape of the pressure. Huid from pneumatic vehicle tires is positioned within the tube 6` and arranged to prevent the escape of gas'from the bottle.

inaterial extends across the chamber formed in the casing 9 substantially perpendicular to the center line of the guide 8 and is rigidly secured at its margins to the walls of the casing. The diaphragm 11 is preferably curved or dished as at 12 and a spring 13 of any siutable form is provided with one end engaging the convex surface of the diaphragm 11 near its center and its opposite end extending into a tubular `projection upon the casing 9.

A screw plug 14 .is also provided in the tubular projection upon the casing 9 at the outer end of the projection and' arranged to engage the outer end of the spring 13 to contact and adjust the pressure of the spring against the `dia hragm 11.

A tube 16 is a so positioned in the tubular guide 8 with one end connected to the concave side of the diaphragm 11 near its center. A cross piece 17A is provided at the opposite end of the tube 16 having a depending member 20 extending toward the valve 7. The several parts being so constructedl and arranged that when the diaphragm 11 is moved toward the guide 8 by the spring 13 the member 20 will engage a part upon the valve 7 and open the valve.

Apertures 18 providedl through the wall of the tube 16 adjacent the diaphragm are adapted to permit free communication between the interior of the tube and the part 19 of the chamber within the casing 9. A

conduit 21 is provided extending from the structed that its resilient resistance approximately counter-balances the minimum fluid pressure in any tire to which my device may be attached and the spring 13 is provided to su ply additional pres/sure upon the valve 7 su cient to balance the'desired tire pressure under any given condition and for this purpose the plug' 14 may be adjusted t9 secure the desired working pressure required.

The device operates in the following manner. Suppose for example, that it is desired to maintain the pressure within the tire at sixty poundsto the square inch. The screw plug 14: is adjusted until the combined force exerted by the diaphragm and spring 13 will just balance a pressure of sixty pounds to the square inch in the space 19. 1f now'the pneumatic tire to which the device is connected leaks or for any other reason the pressure in the tire and chamber 19 falls below sixty pounds to the square inch it is obvious that the diaphragm will move toward the space 19 thus foreingvthe tube 16 Patented dan. 15, 191%. .application led teptember 3, 1919. Serial lilo. www.

toward the casing 6 and engaging and opening the valve 7. When this' occurs the compressed air or gas in the bottle 4 iiows through the casing 6 past thev valve 7 and through the tube 16 and apertures 18 into lthe space 19 thence through the conduit 21 and tube 22 through the connection 23 into the pneumatic tire tending to raise the pressure in the tire and will continue to flow until the pressure in the tire and space 19 is restored to sixt pounds to the square inch, whereupon t e diaphragm is forced Ioutward carrying the tube 16 and releasing combination with a conduit connected to saidtire and extending to said receptacle; and mechanism mounted upon said receptacle comprising a normally closed valve posi-l tioned within said receptacle and controlling an outlet thereof and mechanism connected to said conduit and detachable from said valve adapted to open thevalve only when the pressure in the tire lalls below a certain predetermined point. y

2. In a device of the kind described, a pneumatic tire mountedupon a'wheel and a uid receptacle attached to said wheel, in combination with a conduitconnected to said tire and extending to said receptacle,

and mechanism mounted upon Vsaid recepta-4 cle comprising a normall 'closed valve controlling an outlet to t e receptacle and mechanism connected vto said conduit and detachable from said valve adapted to open the valve only when the res'sure in the tire falls-below a certain pre etermined point.

3. In a device of the kind described, a pneumatic tire mounted. upon a wheel and a fluid receptacle attached to said wheel, in combination with a conduit connected to said tire and extending to said receptacle and mechanism mounted upon said receptacle comprising a normally closed valve ositioned within said receptacle and contro ling an outlet thereof and mechanism connecting said conduit to said valve adapted to open the valve only when the fessure in the tire falls below a certain pre etermined point.

In testimony whereof I have hereunto set m hand in the presence of two subscribing witnesses.

FRANCIS M. WRIGH'I, D. B. RICHARDS.

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